Electric time-switch.



G. E. SCHINDLER.

ELECTRIC TIME SWITCH. APPLICATION man AuG.,1916.

1,227,326. Patented May 22,1917.

T 2 sums-snm l.

16 17 I?. 1 i m/ H AM BM IE7 @D 1.6' -f rt- 17 Hg- T n gime/Mw 6Weolyebkindler,

MAMMA MM G. E. SCHINDLER.

ELECTRIC TIME SWITCH.

APPLICATION FILED Aue.9. I9Is.

1,227,826. PaIenIed May22,1917.

2 SHEETSwSHEET 2.

3mm/vbo@ 'emyesclaz'ndler,

'ms Norms uns ca. fumo-uma. wAsmNmoN, n. c.

GEORGE E. vSCIIhlDlllllilBl, OF ASHLAND, WISCONSIN.

ELECTRIC TIME-SWITCH.

Specicaton of Letters Patent.

Patented May 22, 1917.

Application iled August 9, 1916. Serial No. 114,081.

To all 'folto/a 'it 111mg/ concor/1L.'

Be it lkrnown that I, GEORGE E. SGHINDLER, a citizen of the UnitedStates, residing at Ashland, in the county of Ashland and State of"Wisconsin, have invented new and useful Improvements in ElectricTime-Switches, of which the following is a speciiication.'

This invention relates to a time switch for electric circuits and hasfor its primary object to provide a device of the character set forth by'which a change in time can be accurately accomplished and at the sametime insure a goed electrical connection.

An object of the invention is to construct a time switch of very fewparts in which certain elements can assume various positionscorresponding to different periods of time.

Another object of the invention is the novel manner of constructing atrack so that the contact elements may be renewed when the same hasreached a stage when good electrical contact is not accomplished.

A further object of the invention is to provide a time switch in whichthe movable elements are so associated as to minimize the resistance tothe flow of current.

With these and other objects in view, the invention consists in theconstruction, combination and arrangement of parts as will behereinafter more fully (described, illustrated in the accompanyingdrawings and lcasing and has secured thereto one end of an arm 4.Supported by the casing concentrically of the shaft 8 is an inner track5 and an outer track 6 each formed with a T- shaped slot 7. The tracksare similar in construction with the exception that the outer track 6 isparted at the points 8 and 9 and the section thus formed is held inplace by means of springs 11. A plurality of movable contacts 12 arearranged in the slot 7 of the outer track, the combined length of whichbeing equal to the interval of time that the switch is to allow thepassage of current. A

The arm 4E has secured thereto, a wiper 13 adapted to wipe over themovable contacts 12 but to he spaced from the track 6. Also secured tothe arm l1 is a contact 14E continuously engaging the walls of the slot7 in the inner track 'Ihe arm 4f. is composed of insulating material,and such being the case the wiper 13 is electrically connected to thecontact 141 by the conductor 15.

Mounted upon the easing 1 is a pair of switches 16 and. 17 the formeradapted to directly establish the continuity of the main circuit 18while the latter is arranged to establish the continuity ofthe maincircuit through the shunt circuit 19 the terminals of which areconnected respectively to the inner and outer track.

Take for an example that the time switch is to establish the continuityof the main circuit from 8 p. m. to 1 a. m.; the movable contacts 12 areinserted in the outer track until the distance is bridged between thenumeral 8, upon the scale 2O and the numeral 1. Upon the arm l reachinga point when the wiper 13 reaches the advance contact 12 current williiow through the main circuit and will continue to do so until the wiper13 leaves the rear contact 12.

From this arrangement it will be seen that in a very simple manner I amable to increase the time that the main circuit 18 is energized in sucha manner as to insure a good electrical connection and thus minimize theresistance to the flow of current.

From the foregoing description taken in connection with the accompanyingdrawings the advantage of the construction and the method of operationwill be readily apparent to those skilled in the art in which theinvention. relates and while I have described the principle of operationof the invention together with the device which I now consider to be thebest embodiment thereof, I desire to have it understood that the deviceshown is merely illustrative and that such changes may be made wheny de*sired as are within the scope of the claims.

What I claim is 1. In a time switch, a casing having a circular scale, acircular track mounted on said oasng within said scalo and formed`shaped to slidnbly enga-ge the Walls of the slot in said track andadapted to engage said arm.

2. In a time switch, L casing having a circular scale, a. Circular trackmounted on smid Casing within said scale, and formed with LL T-shupedslot, an arm, and Contacts shaped to shdably engage the Walls of theslot in said ruck and adapted to engage smid zum, n second track, and a,Contact ozu'- l'od by Suid arm and continuously engaging tho Walls of aslot in said second track.

In testimony whereof I ax my signature in presence of two Witnesses.

GEORGE E. SCHINDLER. Witnesses H. A. DAVIS, BLOP FAGINICH.

Copies of this patent may be obtained. for ve cents each, by addressingthe UCommissioner of Yatents,

. Washington, D. C.

